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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31fdbd967f2e87a7c62604b10ab7f7fd9d002e9b8fdb16ef762cf34ccc620bef' 
  AND token = '0CU/WHH69hW7gRFHcWa/qvbnJUYHVqTPWX/ldHfUieg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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