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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '072c28a786441c19710b9e07a819c8928b7cb0eee3d3858e044a89174dd42374' 
  AND token = 'ESnMICJke8Ohav6SFS26RKANqaY9QHx9Au9PBA9HER0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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