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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d593fe5c0b5c1a43c07b95b352ae589eec966f9a796b83a94d51c579f3469c8' 
  AND token = 'jqsmbZ9yelG8a/cfdBlMo3paXbztQLVJ9kxc51B1Dn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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