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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90040b3469894882c8459fdc5366a7c65db58793750f6c6e123e3e97f05cc59c' 
  AND token = 'TUWn3sNOi9S0dc/+iKQkfXWi2DGkFzVkD2bBWOrzEzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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