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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46dc38711d34be482756c734bd8f70cae7470aed3a3a45b950599895427f3602' 
  AND token = '3v4QD0pHU3IW7df25mQfjQATmbf67M5X+D2uuSSghho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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