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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd04c3a406e30af16b4afc2681271cb5cc08219cc275bc6797c635ad785093926' 
  AND token = 'BGhM5wDv9y9Iy5F9mSbLtqXbo0HsrL4GSfQbMhNf9Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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