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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ac8147edbb2130219e5b6cdc36243690b9632b32c4bedb5fd76e6911baf08e1' 
  AND token = '+dwwtuTrGr0QJogyHU9TJCTs58oygtDb2E0jmv5LoCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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