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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46704e83b3b3e0db4b7e04dca21c4dba0f8f7e130d0dc411940bedf4f7375395' 
  AND token = 'NDEYiOCTIIcg5RRQ+IbJ0Dug95CBlGcDqfmVgf1X2gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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