SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41422c6fbd807f6b05998e3b0b2069bae5c7bf481bec3aec8604f806b4495ee5' 
  AND token = 'y7NplGrdrsvM/OsAGJVzFcbuGLSs/VzQm7STk4hYYhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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