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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c3ff2e08a97245c02879718b8f8c40bd88380f1fe2af9e7c247ea46ce988585' 
  AND token = 'QxHUChORVvYX8RmETzryhS6ToGHMq7G6boXIaWHFD6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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