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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c95a664944eaf3bda5817288efcd6ada4e42b030458d2ca30d8edb52efbe2eb3' 
  AND token = 'urfA11Nlgt55ZGNbehwM0uXg/7QoviFsz+mFk1fY0zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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