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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40f7eeefde27ecaee714938e892ec8d5ba4cb4fef8b65f1ddbd71a7f8ae73f82' 
  AND token = 'p9Xi9a5xykB7qIzhtHNIBVkUczwE+qsabpmDefuclkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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