SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd6fd38eaed967a50d17b9fa17c97f129073ea6db75e12911d0f0ca043eca244' 
  AND token = 'Mllc+QBcWSNjSCRWjn5RYkz1XV/2lHSWKr/vK33vUVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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