SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea0b955e6f32af337e56d16125022ef6925024352646716c42139dfe950d15be' 
  AND token = 'RZWtpwYu8jdgV0gePKV0BiUT/5mkWSYjvUg1k/2iBLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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