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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec218d848bad10ff28bbf7c6fef5cfea72b93cb1c7d1f0970c21a35f91c1e8d7' 
  AND token = '80OMaElZiRCTk6wKCJmbNFleoP6GvxuJe1OvOs+YJqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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