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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18ba4fc51ccbeb86d50d8c3d9ae04ced08bdd4d04d8d580e3bc5cb9a8c01c455' 
  AND token = 'FohCBWXbG7AGl6t1pUjUWLGb9FilDGS8n65ucQcFlfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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