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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b18455dfe9c70f4dfb6d175ea1c18fbdb42480f113623519ea2efe10bb2a9c3' 
  AND token = 'n3lEC6AvKD8Hn5w2XzlTZGgiG3dFbOYT6rNJIozyE0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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