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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e96f20c8cb09156d69fe7c40efec514248c0593168b37ba5d75792dadc5943c8' 
  AND token = 'MaHsSNmqTPCfBT8yQsIf3Ne8Lxqq227OMunDhHjCZ+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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