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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ee0f60e98b148118c0faa0f797f90d4e7df002a855db1c5d5c17ddfdda00dfe' 
  AND token = '9tdnZae+/1HkNLpoZOTRW/m4FaYod6aaTDNwcxbCvjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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