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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e90516c280b8505c0fc7b96d87f40427310e5645e68bd4aaa8c5dede4688cc03' 
  AND token = '6YWeBURq2Pn2Kw4/YvQoYPEU3zw7w+PCrPYMtBOiO74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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