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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '737be6be0517d7aadd2e576436c74b445d7e09b97b58f443d33126b74b21646f' 
  AND token = '7fz+g1ZnJg0Y67umu7K6m9vQGjJeryjfnkxuUkJTky0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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