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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e67e9b1b93193e29a949478960a57c108af8d0f15bdfd82ed70757e086a193c1' 
  AND token = 'lzr9RhAjTXHXskO1hvrL9cvyvuANPmBz3j1sBU7Us3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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