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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a83f33537949239dc1f77e24b73dd03df0429020ca77c23838845c6565d95b2f' 
  AND token = 'HHt7BYW2kWL8aB2WWJkXe39Sxxo6Xj8Q4ofV5ECjOtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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