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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91cc5a53ae58eba352b2f0064b7921072e398873eea859b4cc241e8c96ab81f1' 
  AND token = 'jYp75/e2CwODRUuRhmThXCV2DE3DaFM7lZXOnWyNEaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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