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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0de7839e8a2ab96008f847af039efe293e43861fdffbacabf32a6ec713015ab1' 
  AND token = 'nymhU+PMRTDmPdSv3wrAuXdSUvgsVmF5khs6oEW3ICs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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