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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '345d5c04772fc03e95acd855dda58bd7e522bc1224c8025ce7d3c6390051bf31' 
  AND token = 'xWlcLptUQluhiDIALwqXsRFT9bFUxP3Oh9fOXJ+nk3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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