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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eedb63a94a2e5bf868d749892ab6312db39fffc7c85d20dd31bc3b86efea1a3f' 
  AND token = '2KzWg6WDPko1GNQeahkGrMcITKExNB/kt74aLlsV85w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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