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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30035aceecaa45d928ff0c07470a60b4f50b34acb87cb0c5b0c2aae42dc524bb' 
  AND token = '9y/S0R2YnWD2QTpeNn/lr4GRkE6keMsh/pQHohr65II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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