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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8deb08025c986d95eeebf9fe794610c8e1b19751591c636fe51f93e97b73d8c5' 
  AND token = 'la9MQ9YB7lhi3ULukMbFmWCnHBlh7gCuzNp2tkizJ8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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