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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed9c458bba9bd7f0f083a9a11ab9b152b68faf3195dc3bff5b74c4787b8b2efe' 
  AND token = 'iOeD8v1FLKgvMlFfFxY+FARElnj/94qveNzFi/XMTyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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