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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '066a26477a4cdffc3ff0099cb6646e4f7f44a316a7e57ca36f045270771ede36' 
  AND token = 'f1Ye0pBcs5/rv1AME4NQm2bZMCq7TzjJcnjrKTlcxIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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