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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bd75ac8594c31f6c647c0375eae6647ca0c4a509790e780cc58045feac9b77d' 
  AND token = 'KX4UtUiYw4sEs+YUmRSW6RFsrFmpqfK3swDb0VzDF54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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