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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e3f5547c7e07b3068ee74c9a8e47ede79d8c4e24cae7deb4017b5deaef36874' 
  AND token = 'LXg4Fl4HIvGqYweepCM7w2HGdky45laZg3wlJm8sJ5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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