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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3517b03b638a9b2f56674bf933589a1541ed1762a9c4ef0ead8d2fc6dd62dfef' 
  AND token = 'kNLl7IQgC96/xdOLwRBQ3UgHdtCAAwWcKi7mabYLCv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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