SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83e60db5ff6692a160e29e7bbf4f147e527e0ac4bc4cd42fbf3a0f48f0f05a2e' 
  AND token = '1QMo8c0BNVxn6zZWgAq6C8uxI7Jvh9LdSMulYHjX6NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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