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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '820d96284d958f3821c504f2ec39c98e3b428a35fa8669c3073126dcbf445f1c' 
  AND token = 'Ecy4iZXD678j3EVedBEQg1WELLvf7SlW3j33CQmOoUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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