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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecc7bc0cb74dd612a25aaee0b76845d77edb78fdb3dd46521275b28a5b330e8a' 
  AND token = 'bBAGARdPYmd325uNOil/+H5lrKQVKZCHgDaeuX+9Eao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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