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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15f12f1a278b1a00d883aed8aef447160a275909aeef60c4cd548f11ba1bf3ea' 
  AND token = 'ZvFE5RqFytAfHJXnvXhmC8hvF4Iubj0Dq8+9sAsBytE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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