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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '998c540aca195be3a8df6f060739eb590c17ce2cab297bc5daa65536f86059aa' 
  AND token = 'C3FVoTD55AfQ3QgnNR9FMThOrXWFVuOCHPfkko/9bDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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