SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db45e29832380f622199239671b3f01956d263357ac4dd9177dcc066893ac848' 
  AND token = 'ztUeZ1i8p8aAVkCzhkaFJyD2w1Rrzfm9SC/x01+bvFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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