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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b28c6759dc87a83afcc4de93d0d346a3d0ae9f6433f7f4d1b7609caac5dc7fa8' 
  AND token = 'W70EKwd5K2tXVNui1yiV6v0dwkI2u9nTP24qq5fZAV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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