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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a84648def01a81f62ee926a6fa24991a912bddc20bfe68a74097b0fcb5dca90' 
  AND token = '0x6zpLj1F5FaYxgj5QicD54LiahwQ0Ru2ErD5mQvGEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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