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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf2419b4302eb3b7fa24d61ddfa617bcbc778d7d207f5fe5f9f66d6d6a8eaffa' 
  AND token = 'DTBUEdijlolBo4koFG/nSGG0c+jJlwzR4fiQTUkhU8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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