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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '277091d5c00d56783e321b5c893eb58d80522f7c39b10f60a28104536f0c6481' 
  AND token = '9Iui1kl93ItkvxFxOIMyznbCupdNtO8YQF3qWMMwQl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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