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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebc92b853d356c4629056c371f6cc5220c18b05539b9194168e8e2740d699c6a' 
  AND token = 'P1cVjCZuPe92numFJxa8iJGKaZROOYy75OLekPhLGpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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