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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd684cda891c6d20a0b1a91bcbd1b90940f7a47ac81df284a74eeb4f6d18cab98' 
  AND token = 'TDMBj3FAu3ABXBiCD/caIDmdGaVIpLv31IYYiisqUOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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