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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1352134711571f6520f17e5b24c3a0cb2f0ad9afc6db8147bf0efdd5f5e812c7' 
  AND token = '7EaR6QnW9y1W8G26euFah4RJqlw48Zk5P4C9KGx8ZtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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