SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ca7a434e33504f97339902caa1b0fe8da09df1cb8b8b49dc4af6d417f922c65' 
  AND token = '56mFNDYdM0P96Xr4tWHIahRJPMZ/t2ih85/6QzKvEuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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