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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93d66167cb9d39d2680c8b88d1ce85e1645f8e770eb9bd730417e6e5fbe6b2ec' 
  AND token = 'jl1qgwfwOFbgQyagsw1FQCk8dBjrdiGw7pXjVprf9Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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