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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23c4d5a9f47e72bffb17a44dcb4e00e3a5d7db9d086ec63410b2ef26ea1938a0' 
  AND token = 'U/4CZC1sbyBk4Bdo5vgAEYRvYUTjo12LG25XByH3ScE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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