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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4e4ab5106e1b8807997114475dd35f7a82ce50d7e7541e0e6f3dee5f15b3f4d' 
  AND token = '3PEsNHZxcO+DG1fmaM88Mey9kyuvRcf/27DF9RtRlOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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