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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b2ad0a768cc1036c3acd43700364da519eb231e34f79b45693480f5d79c3155' 
  AND token = 'IQ75tqRWVYz78RUqHtfSmm4jwV7nwAqL6aWJjE01TMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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