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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '967ebc193349866d8d962a8ded77c31abbba9fb2b11936a143ff43a260ef7ae9' 
  AND token = 'EcFtonG9KDq7XBsFB0DXuB5CC6f3yQloumHA/omYbDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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