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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5975272afc68a07714d057838dba58b749edf13c8877f24e1addbaf97ad182ed' 
  AND token = 'sgQM0pY2QNwqCqeWiFUt+9W8qVKKm2iMiCHvkbijEW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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