SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b34c7387c0642853293920a5cc98d1f7cce75329fc3449e25270fe7d830bd365' 
  AND token = 'MkILDy1OZA/QuYa/MwS/J8aIqKrhoNC6VIZcqn1xvE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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