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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9700ae2f12db1b6505e56b0dc2e34247b403b90453ab4da49ac8cba57ee6471b' 
  AND token = 'RtYPkZtwbW6Q1D9OdMstKzxklo7cEMAis6tZXKw+e0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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