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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8934ab4df7217fcbf59fb35600d8a5ea7ea9d41996a0f449871bd71ee5e761c7' 
  AND token = 'xgasF1OcExaDU28u6WWRAkzM8cYghN2NyD8fKEyq5CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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