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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '632beab298ab28dd1a61f6b129b26a263bf1f663e180a34c463e092022cc97b9' 
  AND token = 'oMaLbWi7yFF7CK27IOoRlg+CFRvWhmpZVRmbfzRM+aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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