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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '920d98944f06e2112a9033d4515b9b1ff433fafa388a90649a10ad921fe37577' 
  AND token = 'sas84XaPaarNXvAXFsgHPUAX2NIWGUCMqz2d1Q9d1PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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