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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85b65ff79edc111399f36598051795f22a60e8341c68bfda798175a3162922d6' 
  AND token = 'l9Og2zjq5qDVjxc0TH0X3SyfWccjBoQQBD9Df+vAfQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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