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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c862da54803730b7ce3cdd65da08551a05c2c7fd7765ce804d0e6e9e6fa5f1d' 
  AND token = 'aBeKxTMq+DnDgdxSxyN4g70raQIioyelb8Ofmy6EU3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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