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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b74b9003e0be450b84c3480230c7068f138e4c754a85319c2a5cfe87d22cb22b' 
  AND token = 'sqqbnbpTOAIWsi9bissTCio2lrQMcF/Na5auc5bqiGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}